chemical engineering MCQs – Page 106

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

2101. Pick out the correct statement ?
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A. tem separation

B. ponents is linear in the case of steady state equimolal counter-diffusion

C. Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas

D. The Hatta number is important in problems involving gas absorption without chemical

E. ction

F. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both

2102. Pick out the wrong statement?
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A. A sharp increase in pressure drop gives an indication of the flooding in a distillation column

B. Separation of components is not possible in liquid extraction, if selectivity is unity

C. uum

D. Dehydration of ethyl alcohol is most economically done by molecular distillation at very high

E. Critical moisture content is not a property of the material itself

2103. Air initially at 101. 3 kPa and 40C and with a relative humidity of 50%, is cooled at constant pressure to 30C. The cooled air has a____________________?
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A. Higher wet bulb temperature

B. Higher relative humidity

C. Higher absolute (specific) humidity

D. Higher dew point

2104. Which of the following same diameter columns gives lowest pressure drop per unit height ?
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A. Sieve-plate column

B. Randomly packed column

C. Bubble-cap column

D. Packed column (stacked)

2105. Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ?
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A. Wetted wall column

B. Randomly packed column

C. Bubble cap column

D. Sieve plate column

2106. Pick out the correct statement?
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A. The slope of the stripping line is always less than unity

B. reases

C. For a given separation in a binary distillation column, with increase in reflux ratio (above the

D. imum reflux ratio), the fixed cost of the distillation column first increases and then

E. tifying operating lines are vertical at total reflux

F. Kremser-Brown-Souders equation is used to calculate the efficiency of a plate tower

2107. In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because_______________?
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A. Temperature is less

B. dition

C. Total pressure is less

D. Saturated steam is used for steam distillation

E. Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium

2108. McCabe-Thiele method of binary distillation does not assume that the__________________?
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A. None of these

B. Sensible heat changes are negligible compared with latent heat changes

C. Molar latent heats of all components are equal

D. Heat of mixing is negligible

2109. Steady state equimolal counter diffusion occurs in case of ____________________?
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A. Leaching

B. Liquid-liquid extraction

C. Binary phase distillation

D. Absorption

2110. The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or outgassed adsorbent to from a definite concentration of adsorbate is called its_____________________?
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A. Differential heat of adsorption

B. Integral heat of adsorption

C. Heat of wetting

D. Heat of normal condensation

2111. In an operating distillation column, the______________________?
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A. bottom to the top of the column

B. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from

C. Driving force for the liquid flow is its specific weight

D. Vapors and liquids are at their dew point and bubble point respectively

E. Highest temperature is encountered at the top of the column

2112. Adsorption is a unit operation which generally involves _______________ systems?
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A. Liquid-solid

B. Fluid-solid

C. Solid-solid

D. Gas-solid

2113. The term approach in a cooling tower refers to the difference in the temperature of the____________________?
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A. None of these

B. Cold water leaving the tower and the wet bulb temperature of the surrounding air

C. Hot water entering and the cooled water leaving the cooling tower

D. Hot water entering the tower and the wet bulb temperature of the surrounding air

2114. At minimum reflux ratio for a given separation__________________?
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A. Separation is most efficient

B. Minimum number of the theoretical plates is required

C. Number of plates is zero

D. Number of plates is infinity

2115. Positive deviation from Raoults law means a mixture whose total pressure is___________________?
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A. Less than that computed for ideality

B. Less than the sum of the vapour pressure of the components

C. None of these

D. Greater than that computed for ideality

2116. Air at a particular humidity is heated in a furnace. The new dew point_____________________?
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A. Remain unchanged

B. Depends on the extent of heating

C. Increases

D. Decreases

2117. The adiabatic saturation curve for a vapour-gas mixture is__________________?
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A. Slightly concave upward

B. None of these

C. Slightly concave downward

D. Straight line

2118. The efficiency of a plate column will be maximum, when the flow is ideal __________________ the plate?
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A. Across

B. Above

C. Both A. & B.

D. Neither A. nor B.

2119. Which of the following equipments is not used in liquid-liquid extraction ?
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A. Centrifugal extractors

B. Pachuka tank

C. Agitated vessels

D. Packed towers

2120. Deaeration (removal of O2) of water is done by_________________?
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A. Absorption

B. Ion-exchange

C. Adsorption

D. Rectification

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